Toshiba Aquillion 64 CT Scanner. Phantom Center Periphery Center Periphery Center Periphery
|
|
- Madlyn Douglas
- 5 years ago
- Views:
Transcription
1 Comparison of radiation dose and imaging performance for the standard Varian x-ray tube and the Richardson Healthcare ALTA750 replacement tube for the Toshiba Aquillion CT scanners. by Robert L. Dixon, Ph.D., FACR, FAAPM President, Radiological Physics Consultants, Inc. Professor Emeritus, Dept of Radiology Wake Forest University School of Medicine Winston-Salem, NC Designated US CT Expert IEC 62B MT30 CT Committee April 2018 I. Methodology On April 9, 10 we visited the Richardson Healthcare service training facility in Fort Mill, SC which has a Toshiba Aquillion-64 CT scanner in which a new standard Varian CXB-750D/4A (S/N Q7) x-ray tube was installed for our testing purposes and a service calibration performed. After making a series of measurements with the Varian tube, the tube was replaced with a new Richardson Electronics ALTA750 replacement tube from the factory (S/N ABD002H). After installation and re-calibration, the measurements were repeated. In short, same Aquillion-64 CT scanner, same dosimetry system two different x-ray tubes. (These dose results should also apply to the Aquillion-16 and 32 scanners since the same x-ray tube is used therein and the same Toshiba Dose specifications apply.) II. Measurements Radiation Dose: The same set of measurements were made on both tubes to compare the radiation dose delivered (CTDI) for a series of techniques specified by Toshiba for acceptance testing as outlined below. Image performance: A complete American College of Radiology (ACR) accreditation test was run on the scanner for both the Varian and Richardson tubes which includes additional dose measurements for typical clinical techniques. A separate resolution test was also performed.
2 Radiation Dose Results Table I. CTDI100 Measured Dose Values at Toshiba specifications technique 120 kvp, 100 ma, 1 sec, 4 x 4mm (16 mm slice) Toshiba Aquillion 64 CT Scanner Varian tube CTDI100 (mgy) Richardson Tube CTDI100(mGy) Toshiba Specs (± 20%) CTDI100 (mgy) Phantom Center Periphery Center Periphery Center Periphery Head (16 cm) Body (32 cm) Conclusion: Both tubes deliver a value of CTDI100 to within 10% of the Toshiba Specifications shown above for the standard technique - well within the ± 20 % Toshiba tolerance. For the more-reliable phantom center measurements, the Varian and Richardson tubes delivered the same dose within 1% of each other. Measured CTDIvol values The more common representation of CT dose (see Appendix) is CTDIvol which represents a weighted average of the central and peripheral axis CTDI 100 values and which is displayed on the CT monitor for the scan technique used, namely CTDIvol = (1/3)CTDI 100 (center) + (2/3) CTDI 100 (periphery) Table II. CTDIvol Measured Dose Values in mgy at Toshiba specifications technique 120 kvp, 100 ma, 1 sec, 4 x 4mm (16 mm slice) Toshiba Aquillion 64 CT Scanner Phantom Varian tube CTDIvol Richardson Tube CTDIvol Monitor Displayed CTDIvol Toshiba Specs (± 20%) CTDIvol Head (16 cm) Body (32 cm) Midrange Midrange 12.1
3 Conclusion: Both Varian and Richardson tubes deliver a value of CTDIvol to within 3% of each other for the body phantom and within 8% for the head phantom, and both are well-within the Toshiba Specifications shown above for the standard technique, namely easily within the ± 20 % Toshiba tolerance range shown above. The agreement with the displayed CT console CTDIvol value for the body phantom is within 6% for the Varian tube, and within 3% for the Richardson tube. Likewise for the head phantom, the agreement is within -1.5 % and +7% for the Varian and Richardson tubes, respectively. The dose (CTDI) also depends on other factors, most notably the detector acquisition configuration which affects the z collimator aperture (actual beam width). The actual beam width is larger than the nominal width (over-beaming) which increases the dose significantly for narrow beams. The tube voltage (kv) obviously affects the dose. Measurements for these dose adjustment factors for both tubes are given below. Table III. Measured Aperture Dose Adjustment Factors for CTDI 100 (Body Phantom Center) Nominal Collimator setting Varian Tube Richardson Tube Toshiba Specifications 8x4mm (32 mm) x4mm (16 mm) x1mm (1 mm) Conclusion: Dependence of CTDI100 on z-collimator aperture is essentially the same for both Varian and Richardson tubes and in good agreement with published Toshiba specifications. The measured values are also consistent with our actual beam width measurements of 36mm, 19mm, and 4 mm for both tubes 7 (see CTDI-aperture, Dixon et al. Medical Physics 32(12)2005). Table IV. Measured kv dose adjustment factors (peripheral axis body) kv Varian tube Richardson tube Toshiba Spec
4 Conclusion: Near-perfect agreement with kvp variation between Varian and Richardson Tubes as would be expected (same scanner) as well as with Toshiba specifications. AMERICAN COLLEGE OF RADIOLOGY (ACR) ACCREDITATION TESTS A complete ACR accreditation test was performed for both the Varian and Richardson tubes the same required ACR accreditation tests which we perform for our Aquillion-equipped client hospitals and clinics. Typical Image Acquisition Technical Parameters Adult Head Adult Abdomen Pediatric Head Pediatric Abdomen Hi Res Chest kvp ma Time per rotation (sec) mas effective/displayed mas Scan FOV (cm) Display FOV (cm) Reconstruction Algorithm FC 23 FC 17 FC 47 FC 13 FC 86 Axial (A) or Helical (H) H H H H H # of data channels used(n) Z-axis collimation (T, in mm) A: Table increment (mm) or H: Table Speed (mm/rot) (I) Pitch (P, = (I/(NxT))) Reconstructed Scan Width (mm) Reconstructed Scan Interval (mm) Dose Reduction Techniques N/A N/A N/A N/A N/A
5 Varian Tube Displayed CTDIvol (mgy) Measured CTDIvol (mgy) N/A % Difference -4.06% 6.16% -1.55% 4.48% N/A Richardson Tube Displayed CTDIvol (mgy) Measured CTDIvol (mgy) N/A % Difference 1.94% 4.11% 6.20% 8.21% N/A Contrast to Noise Ratio (CNR) Smallest Diameter Cylinders Visible (mm) Mean CT Number Over 25 mm Cylinder (a) Mean CT Number Next to 25 mm Cylinder (b) Std Dev Next to 25 mm Cylinder (c ) Adult Head Adult Abdomen Pediatric Head Pediatric Abdomen Varian Richardson Varian Richardson Varian Richardson Varian Richardson N/A N/A N/A N/A CNR = (a-b)/c CNR Pass Criterion > 1.0 > 1.0 > 0.7 > 0.4 High Contrast (Spatial) Resolution Adult Abdomen Hi Res Chest Varian Richardson Varian Richardson Spatial Frequency Resolved (lp/cm)
6 Uniformity, Noise, and Artifact Evaluation (Using Adult Abdomen Series) Mean Noise (Std Dev) Location Uniformity Varian Richardson Varian Richardson Center Varian Richardson 3 o'clock Center - 3 o'clock No No 6 o'clock Center - 6 o'clock Visible Visible 9 o'clock Center - 9 o'clock Artifacts Artifacts o'clock Center - 12 o'clock Beam Width Measurements Detector Configuration Varian Richardson 1 x 1.0 mm x 4.0 mm x 4.0 mm Conclusion (ACR testing): The doses (CTDIvol) delivered between the Varian and Richardson tubes were comparable to better than 6 % for the clinical techniques of Adult Head, Adult Abdomen, Pediatric Head, and Pediatric Abdomen. In the image quality arena, the Varian and Richardson tubes exhibited essentially equal image quality. The scanner easily met the ACR passing criteria with both tubes. High Contrast Spatial Resolution Measurements with high resolution reconstruction algorithms 1. Nuclear Associates phantom kvp, 200 ma, 1 sec, 4 x 1.0mm, 2-stack, 100 mm FOV, FC 70 algorithm Varian Tube: 11 line-pairs/mm (0.45 mm) Richardson Tube: 11 line-pairs/mm (0.45 mm) 2. ACR phantom (Hi Res Chest technique see ACR previous data page) FC-86 kernal Varian Tube: 10 line-pairs/mm Richardson Tube: 10 line-pairs/mm Conclusion: A side-by-side comparison of the resulting phantom images showed no discernable difference in resolution between the Varian and Richardson tubes.
7 GLOBAL SUMMARY The Varian and Richardson x-ray tubes exhibited comparable performance in the Toshiba Aquillion CT scanner in both the dose and image quality arenas. The doses (CTDIvol) delivered between the Varian and Richardson tubes were comparable to better than 6 % for the clinical techniques of Adult Head, Adult Abdomen, Pediatric Head, and Pediatric Abdomen in the ACR accreditation tests. In the image quality arena, the Varian and Richardson tubes exhibited essentially equal performance in all ACR phantom tests (spatial resolution, contrast-to-noise ratio, uniformity, and freedom from artifacts). This leads to the conclusion that a Richardson Electronics ALTA750 replacement x-ray tube installed in a Toshiba Aqullion CT scanner would be indistinguishable from the standard Varian tube used insofar as the radiation dose delivered and imaging performance is concerned. On-site testing at Richardson Service Training Facility Fort Mill, SC performed by: Robert L. Dixon, Ph.D. Brian Stratmann, M.S. Certified Radiological Physicists (American Board of Radiology). References 1 R.L. Dixon et al. Report of AAPM Task Group 111 Comprehensive methodology for the evaluation of radiation dose in x-ray computed tomography, American Association of Physicists in Medicine, College Park, MD, February 2010, 2 J.M. Boone et al. AAPM report # 204 Size-Specific Dose Estimates (SSDE) in Pediatric and Adult Body CT Examinations (Cross Reference: Report 220) 3 R. L. Dixon and J. M. Boone, Dose equations for tube current modulation in CT scanning and the interpretation of the associated CTDIvol, Med. Phys. 40, (14pp.) (2013). 4 R. L. Dixon, A new look at CT dose measurement: Beyond CTDI, Med. Phys. 30, (2003).
8 5 R. L. Dixon and J. M. Boone, Analytical equations for CT dose profiles derived using a scatter kernel of Monte Carlo parentage with broad applicability to CT dosimetry problems, Med. Phys. 38, (2011). 6 R. L. Dixon and J. M. Boone, Cone Beam CT dosimetry: A unified and self-consistent approach including all scan modalities With or without phantom motion, Med. Phys. 37, (2010). 7 R. L. Dixon, M. T. Munley, and E. Bayram, An improved analytical model for CT dose simulation with a new look at the theory of CT dose, Med. Phys. 32, (2005). 8 R. L. Dixon and J. M. Boone, Stationary table CT dosimetry and anomalous scanner-reported values of CTDIvol, Med. Phys. 41(1), (5pp.) (2014). 9 R. L. Dixon and A. C. Ballard, Experimental validation of a versatile system of CT dosimetry using a conventional ion chamber: Beyond CTDI100, Med. Phys. 34(8), (2007). 10 Dose equations for shift-variant CT acquisition modes using variable pitch, tube current, and aperture, and the meaning of their associated CTDIvol Robert L. Dixon, John M. Boone, and Robert A. Kraft Citation: Medical Physics 41, (2014); doi: / Appendix: Primer on CT dose The CT scanner does not report the actual dose to a given patient. Although the value of the dose-index CTDIvol is directly associated with the CT scan performed on a particular patient (say John Smith), it represents the particular type of scan and technique factors used on Mr. Smith. However, its absolute value in mgy is not necessarily representative of the actual dose received by Mr. Smith, even though it may be recorded in his personal patient record. Rather, CTDIvol represents the dose that would be delivered to a 15 cm long plastic disk (phantom) of either 16 cm or 32 cm diameter (head or body) scanned at the same technique used on Mr. Smith, with the exception of the scan length. CTDIvol represents the dose for a scan length of only 100 mm, being calculated from CTDI100. For automatic tube current modulation 3, CTDI vol is based on the average ma over the entire scan length and CTDI 100 (a bit of a disconnect 3 ) For a body scan, the actual dose to a thin patient will be much larger than that for a thick patient for the same manual scan technique (kvp, mas, n x T, pitch, etc), whereas the reported value of CTDIvol is exactly the same for both. Thus the common value of CTDIvol reported by the scanner in mgy is
9 not likely to represent the dose to either the thin or thick patient, but rather represents the dose to their dosimetry surrogate. Namely, a 32 cm diameter plastic body phantom which is supposed to represent the body habitus of every patient who gets a body scan, whether thick or thin or whether receiving an abdomen or lung scan. The body phantom has no lungs. That being said, the CT dose phantoms are intended to represent a standard patient insofar as dose is concerned; otherwise, why have both head and body phantoms? In fact, national surveys of CT dose to the population are based on using CTDI to represent the patient dose. There is, however, a small subset of your patients for which CTDIvol is representive of the actual average dose across the central scan plane (for a 100 mm scan length). These are patients whose particular body circumference matches the attenuation and absorption of the 32 cm diameter plastic phantom (referred to hereinafter as phantom doubles). For an abdomen scan, a body phantom double would be a relatively large patient roughly a 48 waist size. Since abdomen scans typically cover a length much greater than 100 mm, the actual patient dose would be about 20 % larger than CTDIvol even for a perfect phantom double. The variation in head circumference of the patient population is typically smaller a head phantom double would wear a size 7½ hat. There is a correction to CTDI vol for patient size called SSDE 2 (Size Specific Dose Estimate) but this is not currently reported by CT scanners (see ref. 2 for details). The primary use of CTDIvol is therefore not as an absolute patient dose to the patient being scanned, but rather as a relative dose indicator to assist the CT operator in evaluating the relative dose implications of various choices of CT scan parameters available, and thus to avoid the often unnecessary use of high dose techniques. That is, the value of CTDIvol is displayed on the CT operators console after setting up a scan technique, and before initiating the scan, so it behooves the operator to be familiar with typical values of CTDIvol for routine scan techniques in order to recognize an outlier [the ACR lists such reference levels for a few procedures]. Although the reported dose CTDIvol is by inference directly associated with an individual patient, it is a very crude measure of the actual dose to that patient, so its absolute value is of secondary importance in that regard. However, the value of CTDIvol, together with other patient-specific information, may be quite useful to the medical physicist in reconstructing a more accurate (albeit still approximate) patient dose when such a dose reconstruction is specifically requested. An example would be computing a fetal dose for a pregnant patient receiving a CT scan. The CTDI paradigm does not apply for multiple, or single, axial rotations about a stationary phantom (such as brain perfusion studies in the cine mode 8 ); hence the value of CTDIvol reported by the scanner is not
10 representative of the dose even to a phantom double. DLP (Dose-Length-Product) is the other dose-related parameter reported by the scanner (in mgy.cm) which value is a measure of the total energy deposited in the phantom (and not in the patient) by the scan technique used on the patient, and is based on CTDIvol. As such, it is not further affected by the particular x-ray tube beyond the previously discussed effect on the value of CTDIvol, and needs no further consideration in this document. If CTDIvol is accurate then DLP will likewise be accurate. However, our goal is quite specific and is unaffected by the vagaries of the CT dose reporting system described above. In this study we are testing a replacement tube which is specifically designed to emulate the Varian tube it is replacing. Our dosimetric goal is merely to verify the consistency of the dose delivered (CTDI) using the Richardson replacement tube with that of the Varian tube it replaces. TOSHIBA DOSE SPECIFICATIONS: These are described only as typical dose values about which an expected deviation of ±20 % from one Toshiba scanner to another can be anticipated (all equipped with the same model x-ray tube).
Computed tomography Acceptance testing and dose measurements
Computed tomography Acceptance testing and dose measurements Jonas Andersson Medical Physicist, Ph.D. Department of Radiation Sciences University Hospital of Norrland, Umeå Sweden Contents The Computed
More informationESTABLISHING DRLs in PEDIATRIC CT. Keith Strauss, MSc, FAAPM, FACR Cincinnati Children s Hospital University of Cincinnati College of Medicine
ESTABLISHING DRLs in PEDIATRIC CT Keith Strauss, MSc, FAAPM, FACR Cincinnati Children s Hospital University of Cincinnati College of Medicine CT Dose Indices CTDI INTRODUCTION CTDI 100, CTDI w, CTDI vol
More informationCT Quality Control Manual FAQs
CT Quality Control Manual FAQs General Question: How often will the QC Manual be updated and how will those updates be communicated? Answer: The ACR CT Physics Subcommittee will review any comments, issues
More informationCURRENT CT DOSE METRICS: MAKING CTDI SIZE-SPECIFIC
CURRENT CT DOSE METRICS: MAKING CTDI SIZE-SPECIFIC Keith Strauss, MSc, FAAPM, FACR Cincinnati Children s Hospital University of Cincinnati College of Medicine Acknowledgments John Boone, PhD Michael McNitt-Grey,
More informationImplementation of the 2012 ACR CT QC Manual in a Community Hospital Setting BRUCE E. HASSELQUIST, PH.D., DABR, DABSNM ASPIRUS WAUSAU HOSPITAL
Implementation of the 2012 ACR CT QC Manual in a Community Hospital Setting BRUCE E. HASSELQUIST, PH.D., DABR, DABSNM ASPIRUS WAUSAU HOSPITAL Conflict of Interest Disclaimer Employee of Aspirus Wausau
More information8/18/2011. Acknowledgements. Managing Pediatric CT Patient Doses INTRODUCTION
Managing Pediatric CT Patient Doses Keith J. Strauss, MSc, FAAPM, FACR President X-Ray Computations, Inc. Boston, Massachusetts Acknowledgements Marilyn Goske, MD John Boone, PhD Cynthia McCollough, PhD
More informationCT Dose Estimation. John M. Boone, Ph.D., FAAPM, FSBI, FACR Professor and Vice Chair of Radiology. University of California Davis Medical Center
CT Dose Estimation John M. Boone, Ph.D., FAAPM, FSBI, FACR Professor and Vice Chair of Radiology 1 University of California Davis Medical Center CT Dose Estimation Introduction The CTDI Family of Metrics
More informationDoses from pediatric CT examinations in Norway Are pediatric scan protocols developed and in daily use?
Doses from pediatric CT examinations in Norway Are pediatric scan protocols developed and in daily use? Eva Godske Friberg * Norwegian Radiation Protection Authority, P.O. Box, Østerås, Norway Abstract.
More informationAccounting for Imaging Dose
Accounting for Imaging Dose High Profile Over-exposures Lead to Growing Concern FDA issues warning in October 2009-209 patients exposed to 8 times typical dose for CT brain perfusion scan (3-4 Gy) - Some
More informationSOMATOM Drive System Owner Manual Dosimetry and imaging performance report
www.siemens.com/healthcare SOMATOM Drive System Owner Manual Dosimetry and imaging performance report Table of contents 1 Dosimetry and imaging performance report 5 1.1 Dose information 5 1.1.1 General
More informationDoses from Cervical Spine Computed Tomography (CT) examinations in the UK. John Holroyd and Sue Edyvean
Doses from Cervical Spine Computed Tomography (CT) examinations in the UK John Holroyd and Sue Edyvean Why a new dose survey? Number of enquires received concerning the current NDRL Concern that could
More informationIntroduction and Background
CT Lung Cancer Screening and the Medical Physicist: Background, Findings and Participant Dosimetry Summary of the National Lung Screening Trial (NLST) Randell Kruger, PhD, DABR Medical Physics Section
More informationWhy is CT Dose of Interest?
Why is CT Dose of Interest? CT usage has increased rapidly in the past decade Compared to other medical imaging CT produces a larger radiation dose. There is direct epidemiological evidence for a an increase
More informationCT Optimisation for Paediatric SPECT/CT Examinations. Sarah Bell
CT Optimisation for Paediatric SPECT/CT Examinations Sarah Bell Sarah.bell14@nhs.net Outline 1. Introduction 2. Aims and Objectives 3. Methods 4. Results 5. Discussion 6. Conclusions 7. References Introduction
More informationMeasurement of organ dose in abdomen-pelvis CT exam as a function of ma, KV and scanner type by Monte Carlo method
Iran. J. Radiat. Res., 2004; 1(4): 187-194 Measurement of organ dose in abdomen-pelvis CT exam as a function of ma, KV and scanner type by Monte Carlo method M.R. Ay 1, M. Shahriari 2, S. Sarkar 3, P.
More informationCalculation of Effective Doses for Radiotherapy Cone-Beam CT and Nuclear Medicine Hawkeye CT Laura Sawyer
Calculation of Effective Doses for Radiotherapy Cone-Beam CT and Nuclear Medicine Hawkeye CT Laura Sawyer Department of Medical Physics and Bioengineering, Royal United Hospital, Bath Overview Varian Acuity
More informationAcknowledgments. A Specific Diagnostic Task: Lung Nodule Detection. A Specific Diagnostic Task: Chest CT Protocols. Chest CT Protocols
Personalization of Pediatric Imaging in Terms of Needed Indication-Based Quality Per Dose Acknowledgments Duke University Medical Center Ehsan Samei, PhD Donald Frush, MD Xiang Li PhD DABR Cleveland Clinic
More informationManaging Radiation Risk in Pediatric CT Imaging
Managing Radiation Risk in Pediatric CT Imaging Mahadevappa Mahesh, MS, PhD, FAAPM, FACR, FACMP, FSCCT. Professor of Radiology and Cardiology Johns Hopkins University School of Medicine Chief Physicist
More informationTranslating Protocols Across Patient Size: Babies to Bariatric
Translating Protocols Across Patient Size: Babies to Bariatric Cynthia H. McCollough, PhD, FACR, FAAPM Professor of Radiologic Physics Director, CT Clinical Innovation Center Department of Radiology Mayo
More informationDianna Cody, PhD, DABR, FAAPM Professor & Clinical Operations Director Imaging Physics U.T. M.D. Anderson Cancer Center Houston, TX
Dianna Cody, PhD, DABR, FAAPM Professor & Clinical Operations Director Imaging Physics U.T. M.D. Anderson Cancer Center Houston, TX Learning Objectives: Limitations for estimating patient dose for CT Methods
More informationState of the art and future development for standardized estimation of organ doses in CT
State of the art and future development for standardized estimation of organ doses in CT March 2015 William J. O Connel, Dr. Ph, Senior Medical Physicist Imagination at work. Agenda Introduction Duke Florida
More informationX-Ray & CT Physics / Clinical CT
Computed Tomography-Basic Principles and Good Practice X-Ray & CT Physics / Clinical CT INSTRUCTORS: Dane Franklin, MBA, RT (R) (CT) Office hours will be Tuesdays from 5pm to 6pm CLASSROOM: TIME: REQUIRED
More informationA more accurate method to estimate patient dose during body CT examinations with tube current modulation
A more accurate method to estimate patient dose during body CT examinations with tube current modulation Poster No.: C-0738 Congress: ECR 2014 Type: Scientific Exhibit Authors: A. Kawaguchi 1, Y. Matsunaga
More informationSPECIFIC PRINCIPLES FOR DOSE REDUCTION IN HEAD CT IMAGING. Rajiv Gupta, MD, PhD Neuroradiology, Massachusetts General Hospital Harvard Medical School
SPECIFIC PRINCIPLES FOR DOSE REDUCTION IN HEAD CT IMAGING Rajiv Gupta, MD, PhD Neuroradiology, Massachusetts General Hospital Harvard Medical School OUTLINE 1 st Presentation: Dose optimization strategies
More informationCT Dosimetry in the Clinical Environment: Methods and Analysis
CT Dosimetry in the Clinical Environment: Methods and Analysis Manuel Arreola, Ph.D. DABR Associate Chair of Radiology Director, Medical Physics Graduate Program Department of Radiology University of Florida
More informationOutcomes in the NLST. Health system infrastructure needs to implement screening
Outcomes in the NLST Health system infrastructure needs to implement screening Denise R. Aberle, MD Professor of Radiology and Bioengineering David Geffen School of Medicine at UCLA 1 Disclosures I have
More informationThoracic examinations with 16, 64, 128 and 256 slices CT: comparison of exposure doses measured with an anthropomorphic phantom and TLD dosimeters
Thoracic examinations with 16, 64, 128 and 256 slices CT: comparison of exposure doses measured with an anthropomorphic phantom and TLD dosimeters Poster No.: C-2584 Congress: ECR 2015 Type: Scientific
More informationFetal Dose Calculations and Impact on Patient Care
Fetal Dose Calculations and Impact on Patient Care Matt Hough, MS, DABR, DABMP Florida Hospital Diagnostic Medical Physics and Radiation Safety Resource ACR-SPR Practice Parameter for Imaging Pregnant
More informationVarian Edge Experience. Jinkoo Kim, Ph.D Henry Ford Health System
Varian Edge Experience Jinkoo Kim, Ph.D Henry Ford Health System Disclosures I participate in research funded by Varian Medical Systems. Outline of Presentation Review advanced imaging in Varian Edge Linear
More informationAAPM Annual Meeting. ACR Accreditation Update in CT
AAPM Annual Meeting ACR Accreditation Updates in CT, Ultrasound, Mammography and MRI: ACR Accreditation Update in CT Michael McNitt-Gray, PhD, DABR, FAAPM Professor, Department of Radiological Sciences
More informationCT SCAN PROTOCOL. Shoulder
CT SCAN PROTOCOL Shoulder Purpose and Summary CT images made with this protocol are used to provide the orthopedic surgeon with a detailed 3D anatomical reconstruction of the patient s scapula and proximal
More informationIMAGE GENTLY HOW CAN YOU HELP?
IMAGE GENTLY HOW CAN YOU HELP? Keith J. Strauss, MSc, FAAPM, FACR Director, Radiology Physics & Engineering Children s s Hospital Boston Harvard Medical School Acknowledgment Marilyn J. Goske,, MD Robert
More informationUltralow Dose Chest CT with MBIR
Ultralow Dose Chest CT with MBIR Ella A. Kazerooni, M.D. Professor & Director Cardiothoracic Radiology Associate Chair for Clinical Affairs University of Michigan Disclosures Consultant: GE Healthcare
More informationCardiac CT - Coronary Calcium Basics Workshop II (Basic)
Cardiac CT - Coronary Calcium Basics Workshop II (Basic) J. Jeffrey Carr, MD, MSCE Dept. of Radiology & Public Health Sciences Wake Forest University School of Medicine Winston-Salem, NC USA No significant
More informationCombined Anatomical and Functional Imaging with Revolution * CT
GE Healthcare Case studies Combined Anatomical and Functional Imaging with Revolution * CT Jean-Louis Sablayrolles, M.D. Centre Cardiologique du Nord, Saint-Denis, France Case 1 Whole Brain Perfusion and
More informationAmerican College of Radiology CT Accreditation Program. Testing Instructions
American College of Radiology CT Accreditation Program Testing Instructions (Revised January 6, 2017) This guide provides all of the instructions necessary for clinical tests, phantom tests and general
More informationEstimating Patient Radiation Dose from Computed Tomography
Estimating Patient Radiation Dose from Computed Tomography C. Cagnon, J. DeMarco, E. Angel, M. McNitt-Gray UCLA David Geffen School of Medicine 1 Patient Dose from CT Advances in Technology... Helical
More informationAdopting DAP as a dose metric in CT
Adopting DAP as a dose metric in CT Nick Weir Department of Medical Physics Royal Infirmary of Edinburgh NHS Lothian Dose Area Product (DAP) in CT Hypothesis: There are advantages to using DAP: (i) In
More informationFDG-18 PET/CT - radiation dose and dose-reduction strategy
FDG-18 PET/CT - radiation dose and dose-reduction strategy Poster No.: C-1856 Congress: ECR 2014 Type: Authors: Keywords: DOI: Scientific Exhibit P. Nicholson, S. McSweeney, K. O'Regan; Cork/IE Radiation
More informationPatient / Organ Dose in CT
Patient / Organ Dose in CT Patient specific and organ dose estimation H.D. Nagel Dr. HD Nagel, Science & Technology for Radiology Buchholz / Germany www.sascrad.com 1 Topics CTDI & patient dose SSDE Organ
More informationMeasurements of Air Kerma Index in Computed Tomography: A comparison among methodologies
Measurements of Air Kerma Index in Computed Tomography: A comparison among methodologies Thêssa C. Alonso 1, 2, Arnaldo P. Mourão 1, 3, Teógenes A. Da Silva 1, 2 1 Program of Nuclear Science and Techniques
More informationRadiation Dose Reduction: Should You Use a Bismuth Breast Shield?
Radiation Dose Reduction: Should You Use a Bismuth Breast Shield? Lincoln L. Berland, M.D., F.A.C.R. Michael V. Yester, Ph.D. University of Alabama at Birmingham Breast Radiation on CT Use of chest CT
More informationDental ConeBeam Computed Tomography (CBCT) X-ray Systems
Dental ConeBeam Computed Tomography (CBCT) X-ray Systems PROPOSED REVISIONS TO 4732.XXXX, 1.0 4732.#### DENTAL CONEBEAM COMPUTED TOMOGRAPHY (CBCT) X-RAY SYSTEMS; STATIONARY AND MOBILE. Subpart 1. Applicability.
More informationCT Low Dose Lung Cancer Screening. Part I. Journey to LDCT LCS Program
CT Low Dose Lung Cancer Screening Part I Journey to LDCT LCS Program Paul Johnson, M.S., DABHP, DABR Cleveland Clinic September 26, 2015 Lung Caner is No. 1 In Cancer Related Death In The United States
More informationCT Radiation Risks and Dose Reduction
CT Radiation Risks and Dose Reduction Walter L. Robinson, M.S. D.A.B.S.N.M., D.A.B.M.P., D.A.B.R. Consultant Certified Medical Radiation Health & Diagnostic Imaging Physicist Medical Radiation and Children
More informationMeasurement of computed tomography dose profile with pitch variation using Gafchromic XR-QA2 and thermoluminescence dosimeter (TLD)
Journal of Physics: Conference Series PAPER OPEN ACCESS Measurement of computed tomography dose profile with pitch variation using Gafchromic XR-QA2 and thermoluminescence dosimeter (TLD) To cite this
More informationCT Head Dose Reduction Using Spiral Scanning Protocol
CT Head Dose Reduction Using Spiral Scanning Protocol Reed, William J MD; Broderick, Daniel F, MD; Weindling, Steven M, MD; Czervionke, Leo F MD; and Morin, Richard L; PhD; Mayo Clinic, Department of Radiology;
More informationAn audit of radiation dose of 4D CT in a radiotherapy department
An audit of radiation dose of 4D CT in a radiotherapy department Poster No.: R-0097 Congress: Type: Authors: Keywords: DOI: 2014 CSM Scientific Exhibit T. Hubbard, J. Callahan, J. Cramb, R. Budd, T. Kron;
More informationCTDI versus New AAPM Metrics to assess Doses in CT: a case study
BJRS BRAZILIAN JOURNAL OF RADIATION SCIENCES 04-02 (2016) 01-15 CTDI versus New AAPM Metrics to assess Doses in CT: a case study M. C. S. Campelo a ; M. C. Silva b ; R. A. Terini c a Curso de Física, Pontifícia
More informationMultislice CT versus cone beam CT: dosimetric and image quality comparision.
Multislice CT versus cone beam CT: dosimetric and image quality comparision. Poster No.: C-2589 Congress: ECR 2015 Type: Authors: Scientific Exhibit C. Dionisi 1, A. Crispo 2, E. Stefani 3, A. Lovaglio
More informationTremendous progress in computed tomography (CT) technology
ORIGINAL ARTICLE Demonstration of Dose and Scatter Reductions for Interior Computed Tomography Deepak Bharkhada, MS,* Hengyong Yu, PhD,Þ Robert Dixon, PhD, Yuchuan Wei, PhD,* J. Jeffrey Carr, MD, # J.
More informationChief Radiographer TEI Clinical Associate 2016
MDCT Principles i and Applications Ε ΑGADAKOS MSc Ε. ΑGADAKOS MSc Chief Radiographer TEI Clinical Associate 2016 Aim To understand d recent technological advances in MSCT and how they can be effectively
More informationBrightSpeed Elite CT with ASiR: Comparing Dose & Image Quality Rule Out Pulmonary Embolism on Initial & Follow-Up Exam
GE Healthcare BrightSpeed Elite CT with ASiR: Comparing Dose & Image Quality Rule Out Pulmonary Embolism on Initial & Follow-Up Exam Michael Swack, MD Diagnostic Radiologist Irvington Radiologists, PC
More informationConventional and spiral CT dose indices in Yazd general hospitals, Iran
Iran. J. Radiat. Res., 2006; 3 (4): 183-189 Conventional and spiral CT dose indices in Yazd general hospitals, Iran F. Bouzarjomehri 1*,M.H.Zare 2, D. Shahbazi 2 1 Department of Medical Physics, Shahid
More informationImplementation & optimization of a lung cancer screening CT program. Presented by Izabella Barreto at the 2016 Florida AAPM Chapter Meeting
Implementation & optimization of a lung cancer screening CT program Presented by Izabella Barreto at the 2016 Florida AAPM Chapter Meeting Izabella Barreto, Nathan Quails, Catherine Carranza, Nathalie
More informationSurvey of patients CT radiation dose in Jiangsu Province
Original Article Page 1 of 6 Survey of patients CT radiation dose in Jiangsu Province Yuanyuan Zhou 1, Chunyong Yang 1, Xingjiang Cao 1, Xiang Du 1, Ningle Yu 1, Xianfeng Zhou 2, Baoli Zhu 1, Jin Wang
More informationBreast CT and Dosimetry
2013 ICTP/IAEA Training Course on Radiation Protection of Patients Trieste Breast CT and Dosimetry John M. Boone, Ph.D., FAAPM, FSBI, FACR Professor and Vice Chair (Research) of Radiology Professor of
More informationManaging the imaging dose during image-guided radiation therapy
Managing the imaging dose during image-guided radiation therapy Martin J Murphy PhD Department of Radiation Oncology Virginia Commonwealth University Richmond VA Imaging during radiotherapy Radiographic
More informationHI-Res Extremity Sensation 16
Page 1 Routine Extremity - (2/14/2013) CTDI: ~20 mgy per acquisition Used for evaluation of: Humerus Forearm Femur Knee Tib/Fib Billing: 1. CT Upper/Lower Extremity of concern without contrast, with contrast,
More information354 Korean J Radiol 9(4), August 2008
Review of Failed CT Phantom Image Evaluations in 2005 and 2006 by the CT Accreditation Program of the Korean Institute for Accreditation of Medical Image Hye Jung Park, MD 1 Seung Eun Jung, MD 1, 2 Young
More informationAn Update of VirtualDose Software Used for Assessing Patient Organ Doses from CT Examinations
An Update of VirtualDose Software Used for Assessing Patient Organ Doses from CT Examinations Aiping Ding, X. George Xu Rensselaer Polytechnic Institute Troy, NY USA http://rrmdg.rpi.edu 1 Acknowledgements
More informationTrue Dual Energy. Dr. Stefan Ulzheimer, Siemens Healthcare GmbH. DEfinitely Siemens
DEfinitely Siemens True Dual Energy Dr. Stefan Ulzheimer, Siemens Healthcare GmbH International version. Not for distribution in the US. Unrestricted Siemens AG 2015 All rights reserved. The products/features
More informationReview of TG-186 recommendations
Review of TG-186 recommendations Implementation of advanced brachytherapy dose calculation algorithms beyond TG-43 Rowan M. Thomson Carleton Laboratory for Radiotherapy Physics Carleton University Ottawa
More informationNational Cancer Institute
National Cancer Institute A Dosimetry Summary of CT Participants in the National Lung Screening Trial (NLST) U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES National Institutes of Health AAPM 2015 Anaheim,
More informationQuanitative and qualitative analysis of Image Quality and Imaging Dose of KV CBCT from XVI Elekta Linac.
IOSR Journal of Applied Physics (IOSR-JAP) e-issn: 2278-4861.Volume 9, Issue 5 Ver. IV (Sep. - Oct. 2017), PP 46-52 www.iosrjournals.org Quanitative and qualitative analysis of Image Quality and Imaging
More informationRe: PSM of the National Voluntary Consensus Standard for Patient Safety Measures, 2 nd Report
Re: PSM-044-10 of the National Voluntary Consensus Standard for Patient Safety Measures, 2 nd Report Dear members of the National Quality Forum Board: As Professors of Radiologic Physics (at Mayo Clinic
More informationLow Dose CT Lung Screening: What is Technically Required?
Low Dose CT Lung Screening: What is Technically Required? COMP/CCPM Annual Scientific Meeting Ottawa, Ontario July 15 th, 2017 Yogesh Thakur, PhD, MCCPM Medical Physicist Lead and Regional RSO (X-Ray)
More informationQuality Control and Patient Dosimetry on line for Computed Tomography
Quality Control and Patient Dosimetry on line for Computed Tomography Jose I. Ten 1,2, Eliseo Vano 2,3, Jose M. Fernandez-Soto 2,3, Roberto Sanchez 3, Juan Arrazola 1,2 1 Diagnostic Radiology Service and
More informationHi RES Extremity - (04/18/2011) CTDI: ~13 mgy per acquisition Used for evaluation of: Ankle Elbow Hand Wrist Foot /Calcaneous Toes Fingers
P a g e 1 Hi RES Extremity - (04/18/2011) CTDI: ~13 mgy per acquisition Used for evaluation of: Ankle Elbow Hand Wrist Foot /Calcaneous Toes Fingers Billing: 1. CT Upper/Lower Extremity of concern without
More informationBICOE Breast Imaging Center of Excellence. What is it? - Requirements. National Mammography Database. What do you get? ACR Accreditation in:
BICOE Breast Imaging Center of Excellence What is it? - Requirements William Geiser, MS DABR Senior Medical Physicist MD Anderson Cancer Center Houston, Texas wgeiser@mdanderson.org ACR Accreditation in:
More informationTHE UNIVERSITY OF OKLAHOMA HEALTH SCIENCES CENTER GRADUATE COLLEGE RADIATION DOSE ESTIMATION FOR DIAGNOSTIC MODALITIES
THE UNIVERSITY OF OKLAHOMA HEALTH SCIENCES CENTER GRADUATE COLLEGE RADIATION DOSE ESTIMATION FOR DIAGNOSTIC MODALITIES A THESIS SUBMITTED TO THE GRADUATE FACULTY in partial fulfillment of the requirements
More informationBICOE Stereotactic Breast Biopsy and Breast Ultrasound Accreditation. Introduction. Educational Objectives
BICOE Stereotactic Breast Biopsy and Breast Ultrasound Accreditation William Geiser, MS DABR Senior Medical Physicist MD Anderson Cancer Center Houston, Texas wgeiser@mdanderson.org 1 Introduction Objectives
More informationPatient Dose Estimates. from CT Examinations. Patient Dose Estimates
Patient Dose Estimates from CT Examinations Patient Dose Estimates from CT Examinations John M. Boone, Ph.D. Professor and Vice Chairman of Radiology Professor of Biomedical Engineering University of California,
More informationA comparison of radiation doses from modern multi-slice Computed Tomography angiography and conventional diagnostic Angiography:
A comparison of radiation doses from modern multi-slice Computed Tomography angiography and conventional diagnostic Angiography: Rob Loader Oliver Gosling Introduction Approached by Dr Oliver Gosling (Research
More informationPrepublication Requirements
Issued Prepublication Requirements Standards Revisions for Organizations Providing Fluoroscopy Services The Joint Commission has approved the following revisions for prepublication. While revised requirements
More informationHow to Develop CT Protocols for Children
How to Develop CT Protocols for Children Introduction Prior to 2001 the vast majority of CT imaging of children was conducted using the same or similar techniques used for adult imaging. In 2001, several
More informationImaging Rotation. University of Michigan Department of Radiation Oncology Division of Radiation Physics. Resident:
University of Michigan Department of Radiation Oncology Division of Radiation Physics Imaging Rotation Resident: Rotation staff mentor/ advisor: James Balter, supplemental mentors: Dale Litzenberg, Don
More informationRadiation Dose To Pediatric Patients in Computed Tomography in Sudan
Radiation Dose To Pediatric Patients in Computed Tomography in Sudan Omer Osman,Saeed Medical Physics Department, ALNeelain University, Sudan Presentation outlines Introduction Objectives Materials and
More informationAAPM Task Group 180 Image Guidance Doses Delivered During Radiotherapy: Quantification, Management, and Reduction
AAPM Task Group 180 Image Guidance Doses Delivered During Radiotherapy: Quantification, Management, and Reduction Parham Alaei, Ph.D. Department of Radiation Oncology University of Minnesota NCCAAPM Fall
More informationAutomatic Patient Centering for MDCT: Effect on Radiation Dose
Patient Centering for MDCT CT Imaging Original Research Jianhai Li 1 Unni K. Udayasankar 1 Thomas L. Toth 2 John Seamans 2 William C. Small 1 Mannudeep K. Kalra 1,3 Li J, Udayasankar UK, Toth TL, Seamans
More information3/5/2015. Don t Electrocute Me!: Common Misconceptions in Imaging and Radiation Safety (and What to Do About Them)
Don t Electrocute Me!: Common Misconceptions in Imaging and Radiation Safety (and What to Do About Them) Rebecca Milman Marsh, Ph.D. University of Colorado Department of Radiology Who in the Facility Works
More informationRadiology Rounds A Newsletter for Referring Physicians Massachusetts General Hospital Department of Radiology
Radiology Rounds A Newsletter for Referring Physicians Massachusetts General Hospital Department of Radiology Minimizing CT Radiation Dose CT examinations improve health care and are an essential part
More informationBICOE Stereotactic Breast Biopsy and Breast Ultrasound Accreditation. Introduction. Educational Objectives
BICOE Stereotactic Breast Biopsy and Breast Ultrasound Accreditation William Geiser, MS DABR Senior Medical Physicist MD Anderson Cancer Center Houston, Texas wgeiser@mdanderson.org 1 Introduction Objectives
More informationRegional diagnostic reference levels and collective effective doses from CT scanners in India
Regional diagnostic reference levels and collective effective doses from CT scanners in India Roshan S Livingstone and Paul M Dinakaran Department of Radiology Christian Medical College, Vellore, S India
More informationBringing the power of imaging to your patient. Portable full body 32-slice CT scanner
Bringing the power of imaging to your patient Portable full body 32-slice CT scanner Point-of-care CT imaging Your multi-departmental imaging solution Orthopedic surgery Arthroplasty Musculoskeletal disorders
More informationRadiation Dose Reduction Strategies in Coronary CT Angiography
Radiation Dose Reduction Strategies in Coronary CT Angiography Noor Diyana Osman, PhD noordiyana@usm.my Contents: Introduction Radiation dosimetry in CT Radiation risk associated with coronary CT angiography
More informationSTANDARD OF PRACTICE. Dental CT Scanners CONTENTS. April 2011
April 2011 STANDARD OF PRACTICE Approved by Council April 18, 2011 Dental CT Scanners This document is the standard of practice in relation to the use of dental computed tomography (CT) scanners with respect
More informationCone Beam CT Protocol Optimisation for Prostate Imaging with the Varian Radiotherapy OBI imaging system. Dr Craig Moore & Dr Tim Wood
Cone Beam CT Protocol Optimisation for Prostate Imaging with the Varian Radiotherapy OBI imaging system Dr Craig Moore & Dr Tim Wood Background With the increasing use of CBCT imaging alongside complex
More informationOriginal Article Thoracic Imaging
Original Article Thoracic Imaging https://doi.org/10.3348/kjr.2018.19.6.1179 pissn 1229-6929 eissn 2005-8330 Korean J Radiol 2018;19(6):1179-1186 Size-Specific Dose Estimation In the Korean Lung Cancer
More informationPatient Dosimetry in Mammography and Tomosynthesis:
2013 ICTP/IAEA Training Course on Radiation Protection of Patients Trieste Patient Dosimetry in Mammography and Tomosynthesis: What to measure, why and how John M. Boone, Ph.D., FAAPM, FSBI, FACR Professor
More informationRADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY. L19: Optimization of Protection in Mammography
IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY L19: Optimization of Protection in Mammography
More informationPediatric chest HRCT using the idose 4 Hybrid Iterative Reconstruction Algorithm: Which idose level to choose?
Journal of Physics: Conference Series PAPER OPEN ACCESS Pediatric chest HRCT using the idose 4 Hybrid Iterative Reconstruction Algorithm: Which idose level to choose? To cite this article: M Smarda et
More informationGATE MONTE CARLO DOSIMETRY SIMULATION OF MARS SPECTRAL CT
GATE MONTE CARLO DOSIMETRY SIMULATION OF MARS SPECTRAL CT R Aamir, C Lowe, J Damet, P Carbonez, A P H Butler, N Schleich, N G Anderson MARFO, Emmanuel Geant4 User Workshop 2017, Wollongong Overview MARS
More informationUtilization of a Patient Dose Tracking and Monitoring System to Modify CT Protocols and Lower Patient Doses
Utilization of a Patient Dose Tracking and Monitoring System to Modify CT Protocols and Lower Patient Doses Randell Kruger, Ph.D. Medical Physics and Radiation Safety Marshfield Clinic Health Systems Learning
More informationSasa Mutic a) Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri 63110
Quality assurance for computed-tomography simulators and the computedtomography-simulation process: Report of the AAPM Radiation Therapy Committee Task Group No. 66 Sasa Mutic a) Department of Radiation
More informationSkyscan 1076 in vivo scanning: X-ray dosimetry
Skyscan 1076 in vivo scanning: X-ray dosimetry DOSIMETRY OF HIGH RESOLUTION IN VIVO RODENT MICRO-CT IMAGING WITH THE SKYSCAN 1076 An important distinction is drawn between local tissue absorbed dose in
More informationMVCT Image. Robert Staton, PhD DABR. MD Anderson Cancer Center Orlando. ACMP Annual Meeting 2011
MVCT Image Guidance and QA Robert Staton, PhD DABR MD Anderson Cancer Center Orlando ACMP Annual Meeting 2011 Disclosures MDACCO has received grant funding from TomoTherapy, Inc. Overview TomoTherapy MVCT
More informationACR MRI Accreditation Program. ACR MRI Accreditation Program Update. Educational Objectives. ACR accreditation. History. New Modular Program
ACR MRI Accreditation Program Update Donna M. Reeve, MS, DABR, DABMP Department of Imaging Physics University of Texas M.D. Anderson Cancer Center Educational Objectives Present requirements of the new
More information4D PET: promises and limitations
4D PET: promises and limitations Tinsu Pan, Ph.D. M.D. Anderson Cancer Center The University of Texas Background Outlines Gating techniques: Deep inspiration breath hold 4D PET/CT Non-gating techniques
More information